This is the Roger Gracie hook: the day-one cross choke, done from mount, against people who knew it was coming. BJJ Fanatics has the wrist-blade mechanics; BJJ Heroes has the title resume. Sources: - https://bjjfanatics.com/blogs/news/the-collar-choke-wrist-blades - https://www.bjjheroes.com/bjj-fighters/roger-gracie-bio